We demonstrate novel plasmon resonator geometries consisting of ultra-smooth metal surfaces that support surface plasmon polariton modes exhibiting record-high quality factors in the visible frequency range. The resonators are utilized to achieve record narrow-linewidth, low-threshold surface-plasmon-polariton lasing at optical frequencies, as well as exhibit high figure-of-merit sensing. The lasing threshold of the plasmon-laser was further minimized by leveraging grating-coupled plasmons to pump the lasing-plasmons with strong spatial overlap and minimum perturbation. The results predict potential applications in small-volume optical sensing or energy-efficient coherent on-chip optical sources.
Amit Agrawal, Wenqi Zhu, Henri J. Lezec, Shawn Divitt, and Ting Xu, "Nanolasers based on high-quality factor plasmonic resonators (Conference Presentation)," Proc. SPIE 10345, Active Photonic Platforms IX, 103450H (Presented at SPIE Nanoscience + Engineering: August 06, 2017; Published: 25 September 2017); https://doi.org/10.1117/12.2274270.5588446486001.
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